<template>
  <div class="todo-footer">
    <label>
      <input type="checkbox" :checked="isAll" @input="handlerCheckAll" />
    </label>
    <span>
      <span>已完成{{ finishTodo }}</span> / 全部{{ total }}
    </span>
    <button class="btn btn-danger" @click="handlerDeleteTodo">
      清除已完成任务
    </button>
  </div>
</template>

<script>
export default {
  name: "Footer",
  props: ["todos", "clearCheckedTodo", "checkAllTodo"],
  computed: {
    total() {
      return this.todos.length;
    },
    // 计算完成的量
    finishTodo() {
      return this.todos.filter((item) => item.done).length;
    },
    isAll() {
      return this.todos.every((item) => item.done);
    },
  },
  methods: {
    handlerDeleteTodo() {
      if (confirm("是否要清空已经完成的")) {
        this.clearCheckedTodo();
      }
    },
    handlerCheckAll(event) {
      this.checkAllTodo(event.target.checked);
    },
  },
};
</script>

<style scoped>
/*footer*/
.todo-footer {
  height: 40px;
  line-height: 40px;
  padding-left: 6px;
  margin-top: 5px;
}
.todo-footer label {
  display: inline-block;
  margin-right: 20px;
  cursor: pointer;
}
.todo-footer label input {
  position: relative;
  top: -1px;
  vertical-align: middle;
  margin-right: 5px;
}
.todo-footer button {
  float: right;
  margin-top: 5px;
}
</style>